Outline of the contents: ?K3(D;5
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1. Basic Interferometers for Optical Testing q]\g,a
2. Phase-Shifting Interferometry c~v~2DM
3. Specialized Optical Tests v%RP0%%{s
4. Long Wavelength Interferometry zdp/|"D!
5. Testing of Aspheric Surfaces HWVtop/
6. Measurement of Surface Microstructure l3IWoa&sh
7. Absolute Measurements Zt3)]sB
8. Concluding Remarks